Sororate

Sororate is Complementary to the practice of levirate. It is the practice of marrying sister...

Polygamy

It refers to a marriage to more than one person i.e plurality of husbands...

Polyandry

It refers to marriage in which more than one  husbands are engaged in marital...

Polygyny

it refers to marriage in which one common husband is engaged in marital ties with more...